llvm/lib/Target/Mips/MipsModuleISelDAGToDAG.cpp

   1 //===----------------------------------------------------------------------===//
   2 // Instruction Selector Subtarget Control
   3 //===----------------------------------------------------------------------===//
   4
   5 //===----------------------------------------------------------------------===//
   6 // This file defines a pass used to change the subtarget for the
   7 // Mips Instruction selector.
   8 //
   9 //===----------------------------------------------------------------------===//
  10
  11 #include "Mips.h"
  12 #include "MipsTargetMachine.h"
  13 #include "llvm/CodeGen/MachineFunctionPass.h"
  14 #include "llvm/CodeGen/StackProtector.h"
  15 #include "llvm/CodeGen/TargetPassConfig.h"
  16 #include "llvm/Support/Debug.h"
  17 #include "llvm/Support/raw_ostream.h"
  18
  19 using namespace llvm;
  20
  21 #define DEBUG_TYPE "mips-isel"
  22
  23 namespace {
  24   class MipsModuleDAGToDAGISel : public MachineFunctionPass {
  25   public:
  26     static char ID;
  27
  28     MipsModuleDAGToDAGISel() : MachineFunctionPass(ID) {}
  29
  30     // Pass Name
  31     StringRef getPassName() const override {
  32       return "MIPS DAG->DAG Pattern Instruction Selection";
  33     }
  34
  35     void getAnalysisUsage(AnalysisUsage &AU) const override {
  36       AU.addRequired<TargetPassConfig>();
  37       AU.addPreserved<StackProtector>();
  38       MachineFunctionPass::getAnalysisUsage(AU);
  39     }
  40
  41     bool runOnMachineFunction(MachineFunction &MF) override;
  42   };
  43
  44   char MipsModuleDAGToDAGISel::ID = 0;
  45 }
  46
  47 bool MipsModuleDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
  48   LLVM_DEBUG(errs() << "In MipsModuleDAGToDAGISel::runMachineFunction\n");
  49   auto &TPC = getAnalysis<TargetPassConfig>();
  50   auto &TM = TPC.getTM<MipsTargetMachine>();
  51   TM.resetSubtarget(&MF);
  52   return false;
  53 }
  54
  55 llvm::FunctionPass *llvm::createMipsModuleISelDagPass() {
  56   return new MipsModuleDAGToDAGISel();
  57 }